CN100485763C - Source pole driving device and driving method for display panel - Google Patents
Source pole driving device and driving method for display panel Download PDFInfo
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- CN100485763C CN100485763C CNB2005100854506A CN200510085450A CN100485763C CN 100485763 C CN100485763 C CN 100485763C CN B2005100854506 A CNB2005100854506 A CN B2005100854506A CN 200510085450 A CN200510085450 A CN 200510085450A CN 100485763 C CN100485763 C CN 100485763C
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- source electrode
- display panel
- view data
- distributions
- driving device
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Abstract
The source drive device and the display panel driving method are suitable for display panel of LCD. The source drive device includes a source driver and a current regulator. The source driver is used to receive image data and output image data through the source lines so as to drive the display panel for image display. The current regulator connected electrically to the source driver judges the image data the source driver receives and regulates the drive currents to the source lines so as to homogenize the image blocks in the display.
Description
Technical field
The present invention relates to a kind of source electrode driving device, and be particularly related to source electrode driving device and the driving method thereof of a kind of drive current of adjusting source electrode distribution with solution block inequality (block dim) phenomenon.
Background technology
Along with human civilization advance, image device becomes the product that is seen everywhere in the daily life already, wherein display indispensable member in these image devices especially.The user reads information by display, even passes through the running of the indirect control device of display.In recent years, the existing trend that replaces conventional cathode ray tube (CRT) display gradually of flat-panel screens (FPD).Flat-panel screens is made principle according to it can be divided into LCD (LCD), plasma display (PDP), organic light emitting display (OLED), Field Emission Display (FED) etc.
Figure 1A is the block scheme of the display panel drive device of LCD.Please refer to Figure 1A, this display panel drive device 100 comprise display panel 110, source electrode driver 120 with gate drivers 130, wherein display panel 110 is provided with crisscross m bar source electrode wiring SL 1～SLm and n bar gate wirings GL1～GLn, and each bar gate wirings and source electrode distribution intersection part all dispose a pixel 115.
Figure 1B is the synoptic diagram of some pixels in the display panel of Figure 1A.Please refer to Figure 1B, pixel 115 comprises as the transistor T of on-off element and in order to the storage capacitors Cst of storage data, and can have some stray capacitance Cgs between gate wirings and the source electrode distribution.When source electrode driver 120 is delivered to source electrode distribution desire driving pixel 115 with the view data that is received, change moment in the view data that the source electrode distribution is transmitted in signal polarity, can produce back flow current (return current) by these stray capacitances Cgs, and be back to gate drivers 130 by gate wirings.
In fact, gate drivers 130 comprises several grid drive chip, and each grid drive chip is responsible for the driving task of several gate wirings, thus must cabling between the grid drive chip to transmit signal.In the prior art, (it walks line impedence about 0.5 ohm (Ω) to work for Printed Circuit Board, PCB) the signal cabling at printed circuit board (PCB).
But, in order to reduce cost, improve the purpose of reliability and product miniaturization, at present gate drivers 130 generally can adopt and chip is fixed on glass (it is on the display panel of substrate that grid drive chip directly is made in the glass material for Chip On Glass, mode COG).But, the line impedence of walking on the glass substrate is 15 Ω～100 Ω, with big tens of times by comparison of prior arts.
At this moment, the back flow current that is produced by stray capacitance Cgs can flow to gate drivers 130 by gate wirings and flows through cabling on the glass substrate again.And walk the voltage difference that line impedence causes, and can cause the driving voltage of each grid drive chip output inconsistent, therefore the different grid drive chip indication range of being responsible for driving has the phenomenon of block inequality (block dim).
Summary of the invention
Purpose of the present invention just provides a kind of source electrode driving device, according to image to display, suitably adjusts the electric current that drives display panel, to solve the phenomenon of block inequality.
Another object of the present invention just provides a kind of displaying panel driving method, in order to reduce back flow current, the situation of block inequality when solving display image.
The present invention proposes a kind of source electrode driving device, is applicable to the display panel of LCD, and this source electrode driving device comprises source electrode driver and current regulator.Wherein, source electrode driver is in order to receiving view data, and utilizes many source electrode distribution output image datas, to drive the display panel display image.And current regulator is electrically connected to source electrode driver, and judge according to the view data that source electrode driver received, the voltage difference that causes any two adjacent source distributions in these source electrode distributions when view data is during greater than preset value, the starting current regulator is adjusted the drive current of these source electrode distributions, for example reduces drive current.
According to the described source electrode driving device of preferred embodiment of the present invention, also comprise storer, static RAM for example is in order to temporary this view data.In addition, it is the LCD of on-off element that the present invention generally is applied in the thin film transistor (TFT), especially adopts chip is fixed to Thin Film Transistor-LCD on glass.
The present invention proposes a kind of displaying panel driving method, is applicable to the display panel of LCD, and wherein display panel drives by many source electrode distributions.This displaying panel driving method comprises: receive view data; Judge that according to view data the voltage difference that causes wantonly two adjacent source distributions in these source electrode distributions when view data is adjusted at the drive current of these source electrode distributions during greater than preset value, for example reduces drive current; And drive the display panel display image with the drive current of adjusting the back by these source electrode distributions.In one embodiment, according to view data, the voltage difference that causes wantonly two adjacent source distributions in these source electrode distributions when view data is during greater than preset value, reduce drive current, or reduce the drive current of wantonly two adjacent source distributions in aforesaid these source electrode distributions at these source electrode distributions.
By judging the view data that is received, adjust the drive current that drives display panel, the present invention can reduce back flow current to solve the phenomenon of block inequality when display image.
State with other purpose, feature and advantage and can become apparent on the present invention for allowing, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Figure 1A is the block scheme of the display panel drive device of LCD.
Figure 1B is the synoptic diagram of some pixels in the display panel of Figure 1A.
Fig. 2 is the source electrode driving device drawn according to preferred embodiment of the present invention and the block scheme of display panel drive device.
Fig. 3 is the oscillogram of the gate wirings change in voltage that stray capacitance Cgs caused that has earlier and draw according to preferred embodiment of the present invention.
Fig. 4 is the process flow diagram according to the displaying panel driving method of preferred embodiment of the present invention.
The main element description of symbols
S410～S440: according to each step of the displaying panel driving method process flow diagram that the present invention drew
100,200: display panel drive device
110,210: display panel
115: pixel
120,220: source electrode driver
130,230: gate drivers
240: current regulator
245: storer
250: source electrode driving device
310,320: voltage waveform
SL1～SLm: source electrode distribution
GL1～GLn: gate wirings
Cst: storage capacitors
Cgs: stray capacitance
T: transistor
Embodiment
In order to solve the phenomenon of liquid crystal display displays block inequality, the present invention proposes a kind of source electrode driving device and displaying panel driving method, utilizes the drive current of adjusting the source electrode distribution, to reduce the back flow current of gate wirings.In addition, the present invention generally is applied in thin film transistor (TFT) (Thin FilmTransistor, TFT) be the LCD of on-off element, especially its gate drivers adopts and chip is fixed to (COG) mode on glass directly is made on the substrate of glass material.
Fig. 2 is the source electrode driving device drawn according to preferred embodiment of the present invention and the block scheme of display panel drive device.Please refer to Fig. 2, display panel drive device 200 comprise display panel 210, source electrode driving device 250 with gate drivers 230.Wherein, display panel 210 is provided with crisscross m bar source electrode wiring SL 1～SLm and n bar gate wirings GL1～GLn, and each bar gate wirings and source electrode distribution intersection part all dispose a pixel.
In order to adjust the drive current of source electrode distribution, the present invention's source electrode driving device 250 comprises source electrode driver 220, current regulator 240 and storer 245.Wherein, source electrode driver 220 receives view data, and utilizes source electrode wiring SL 1～SLm to drive display panel 210 with display image.And current regulator 240 is electrically connected to source electrode driver 220, and judges according to the view data that source electrode driver 220 is received.In addition, storer 245 is electrically connected to current regulator 240, judges for current regulator 240 in order to image data temporary, and wherein storer 245 can be volatile memory such as static RAM (SRAM).
The voltage difference that causes wantonly two adjacent source distributions among source electrode wiring SL 1～SLm when view data is during greater than preset value, and the back flow current that expression produces this moment is excessive.Therefore, starting current regulator 240 is adjusted the drive current on source electrode wiring SL 1～SLm, for example reduce drive current, reduce the back flow current of gate drivers 230 indirectly, the driving voltage gap that makes chip for driving in the gate drivers 230 export reduces, and solves the phenomenon that shows the block inequality to reach.
Though it is on the display panel of substrate that gate drivers 230 adopts the COG mode directly to be made in the glass material, but current regulator 240 can design on printed circuit board (PCB) (PCB), promptly can be made in the same circuit board, even make special IC (ASIC) chip with source electrode driver 220.
Fig. 3 is the oscillogram of the gate wirings change in voltage that stray capacitance Cgs caused that has earlier and draw according to preferred embodiment of the present invention.Please refer to Fig. 3, voltage waveform 310 is for being subjected to the influence of the stray capacitance Cgs shown in Figure 1B in the prior art, and causing the driving voltage difference Δ VGL1 of gate wirings is 945 millivolts (mV).Then when adopting the present invention's source electrode driving device, the driving voltage difference Δ VGL2 of gate wirings is 725mV to voltage waveform 320, and the driving voltage that can find can to reduce really gate wirings is poor, to solve the phenomenon that shows the block inequality.
The present invention proposes a kind of displaying panel driving method flow process in addition, as shown in Figure 4.For making explanation clearer, the method flow diagram of Fig. 4 can cooperate the device reference together of Fig. 2.At first, in step S410, source electrode driver 220 receives view data.In step S420, current regulator 240 is judged according to the reception view data.
The voltage difference that causes wantonly two adjacent source distributions among source electrode wiring SL 1～SLm when view data then forwards step S430 to during greater than preset value, and starting current regulator 240 is adjusted (mainly reducing) drive currents on source electrode wiring SL 1～SLm.Then,, forward step S440 to and drive display panel to adjust the drive current of back by source electrode wiring SL 1～SLm with display image.Otherwise, when the voltage difference of wantonly two adjacent source distributions is not more than preset value, then directly forward step S430 to, drive display panel with display image.In other embodiments, can be designed to only adjust the drive current of aforesaid wantonly two adjacent source distributions.
In sum, the present invention proposes a kind of source electrode driving device and displaying panel driving method, by judging the view data that is received, adjust the drive current of the source electrode distribution that drives display panel, to reduce to be back to the back flow current of gate drivers, the phenomenon of block inequality is solved when making display image.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any person of ordinary skill in the field; without departing from the spirit and scope of the invention; when can doing a little change and improvement, so the present invention's protection domain is as the criterion when looking the claim person of defining.
Claims (7)
1. source electrode driving device is applicable to the display panel of LCD to it is characterized in that this source electrode driving device comprises:
Source electrode driver in order to the reception view data, and utilizes a plurality of source electrode distributions to export this view data, to drive this display panel display image; And
Current regulator, be electrically connected to this source electrode driver, according to this view data,, start this current regulator and adjust the drive current that this source electrode driver is exported by above-mentioned source electrode distribution when wantonly two voltage differences of stating the source electrode distribution on adjacent during greater than preset value.
2. source electrode driving device according to claim 1 is characterized in that also comprising storer, in order to temporary this view data.
3. source electrode driving device according to claim 2 is characterized in that this storer is a static RAM.
4. source electrode driving device according to claim 1 is characterized in that this LCD is a Thin Film Transistor-LCD.
5. displaying panel driving method is applicable to the display panel of LCD to it is characterized in that this display panel is driven by a plurality of source electrode distributions, and this displaying panel driving method comprises:
Receive view data;
According to this view data,, be adjusted at the drive current of above-mentioned source electrode distribution when the voltage difference of wantonly two adjacent source distributions of above-mentioned source electrode distribution during greater than preset value; And
Drive this display panel display image by above-mentioned source electrode distribution with the drive current of adjusting the back.
6. displaying panel driving method according to claim 5 is characterized in that according to this view data, when the voltage difference of wantonly two adjacent source distributions of above-mentioned source electrode distribution during greater than this preset value, reduces the drive current at above-mentioned source electrode distribution.
7. displaying panel driving method according to claim 5 is characterized in that according to this view data, when the voltage difference of wantonly two adjacent source distributions of above-mentioned source electrode distribution during greater than this preset value, reduces the drive current of above-mentioned wantonly two adjacent source distributions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100854506A CN100485763C (en) | 2005-07-20 | 2005-07-20 | Source pole driving device and driving method for display panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100854506A CN100485763C (en) | 2005-07-20 | 2005-07-20 | Source pole driving device and driving method for display panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1901019A CN1901019A (en) | 2007-01-24 |
| CN100485763C true CN100485763C (en) | 2009-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100854506A Expired - Fee Related CN100485763C (en) | 2005-07-20 | 2005-07-20 | Source pole driving device and driving method for display panel |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200905642A (en) | 2007-07-16 | 2009-02-01 | Mstar Semiconductor Inc | Liquid crystal driving device capable of self-adjusting driving force and its method |
| KR20150010206A (en) * | 2013-07-18 | 2015-01-28 | 주식회사 실리콘웍스 | Source driver and bias current adjusting method thereof |
| CN105976783B (en) * | 2016-07-20 | 2018-03-20 | 深圳市华星光电技术有限公司 | Data-signal driving method and drive device |
| CN107886896B (en) * | 2017-11-03 | 2019-08-23 | 惠科股份有限公司 | Three colors and four color pixel display panel compatible systems and method |
| US11837164B2 (en) | 2019-09-17 | 2023-12-05 | Hefei Xinsheng Optoelectronics Technology Co., Ltd. | Drive control circuit and related driving method thereof, and display panel |
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- 2005-07-20 CN CNB2005100854506A patent/CN100485763C/en not_active Expired - Fee Related
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| CN1901019A (en) | 2007-01-24 |
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